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=head1 NAME

d2i_DHparams, i2d_DHparams - PKCS#3 DH parameter functions

=head1 SYNOPSIS

 #include <openssl/dh.h>

 DH *d2i_DHparams(DH **a, const unsigned char **pp, long length);
 int i2d_DHparams(DH *a, unsigned char **pp);

=head1 DESCRIPTION

These functions decode and encode PKCS#3 DH parameters using the
DHparameter structure described in PKCS#3.

Otherwise these behave in a similar way to d2i_X509() and i2d_X509()
described in the L<d2i_X509(3)> manual page.

=head1 RETURN VALUES

d2i_DHparams() returns a valid B<DH> structure or NULL if an error occurred.

i2d_DHparams() returns the length of encoded data on success or a value which
is less than or equal to 0 on error.

=head1 SEE ALSO

L<d2i_X509(3)>

=head1 COPYRIGHT

Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

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